Last date to file trading tax for 2020-21?

Taxation
1

I am filling for tax first time, last year, I earned 6.5 lakh from trading and 10 lakh from other stuff. What is the last date to file tax? I want to file as late as possible, because I use those money for trading and earn more profit.

So I am filling first time, need a bit help, thank you.

2

There is no separate date for trading tax. All tax needs to be filed before 30th Sept.